JP2002247024A - Method for distribution data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide service capable of protecting the right of contents such as copyright by defining a method for presenting contents to viewers, application conditions, the storage of contents in a ciphered state, limited reception to a terminal, limited reception to each individual, etc., on the broadcasting side, distributing the defined contents to the receiving side together with the contents and executing viewer's viewing control, storage control, copying control, cipher/ decipher control, etc., on the basis of the defined contents. SOLUTION: An integrated data distribution system attaches meta-data to be information related to contents to each contents. The name and details of contents, general information such as the constitution of the contents, control information concerned with storing/reproducing processing, control information concerned with charging processing, and information concerned with copyright protection such as information concerned with a contents ciphering method such as a contents deciphering key are described in the meta-data. Viewer's viewing control, storage control, copying control, cipher/decipher control, etc., are executed on the basis of the information of the metal-data. Consequently the right of contents, user's right, etc., can be protected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data distribution method in which a content is provided on a content providing side and a content is received and used on a using side.
The present invention relates to a data distribution method provided with a mechanism for adding metadata as content-related information to content and distributing the content.

[0002]

2. Description of the Related Art In BS digital broadcasting, SI (Service Information) is defined as information relating to contents. Although this information is content-related information, it is specialized for an EPG (Electric Program Guide) and is not content-related information corresponding to various contents. Since means for defining detailed information on various contents is not currently defined in the broadcasting standard, it is not possible to provide detailed services based on control for each content. In addition, since the existing broadcast is a service with a view to viewing the content in real time, information for performing content accumulation control and copy control is scarce.

[0003]

As described above, EPG is used as a means for defining information related to content.
Since only (electronic program guide) does not exist in the current satellite digital broadcasting standard, detailed information cannot be defined. As a result, there is a problem that the content control service using the detailed information on the content cannot be performed. In addition, since information for performing content storage control and copy control is scarce, it is not always sufficient for use in storage-based broadcasting.

[0004] It is an object of the present invention to provide a data distribution method for storing control-type broadcasting and adding control information capable of protecting contents. Another object of the present invention is to attach metadata, which is content-related information, to each content. This metadata includes general information such as the name and content of the content, the configuration in the content, control information on the storage / reproduction process, control information on the billing process, and information on the content encryption method such as a content decryption key. Information about copyright protection is described. Based on the information, the viewer control, the storage control, the copy control, the encryption / decryption control, and the like are performed. The present invention
It is an object of the present invention to enable content protection, user right protection, and the like.

[0005]

The integrated data distribution system of the present invention attaches metadata, which is content-related information, to each content. This metadata includes general information such as the name and content of the content, the configuration in the content, control information on the storage / reproduction process, control information on the billing process, and information on the content encryption method such as a content decryption key. Information about copyright protection is described. Based on the information, the viewer control, the storage control, the copy control, the encryption / decryption control, and the like are performed. This enables the protection of the content rights, the protection of the user rights, and the like.

According to the solution of the present invention, contents are distributed using a communication line or a media medium, and the contents encrypted on the transmitting side are stored in the receiving side in an encrypted state, and transmitted together with the contents when the contents are used. The receiving side determines the use of the content by using the metadata storing the related information of the content including the information on the presentation method / usage condition / content encryption key of the content distributed from the side. In a data distribution method capable of protecting rights, a transport stream (TS) grouped in one or a plurality of broadcast units is distributed, and a plurality of elementary streams (ES) included in each TS include: Network information that is common information in each TS indicating the network configuration Information table (NI
T) NIT stream and program map table (PMT) indicating each service delivered in each TS
Program specifying table (PA
T), a PAT stream, a pre-contract metadata stream storing pre-contract metadata for each user, and a limited service including pay broadcasting in each TS, and the pre-contract metadata is distributed. Access table (CAT) containing a conditional access system descriptor indicating the identifier of a TS packet related to conditional access
And a receiving terminal, the receiving terminal comprising:
A data distribution method for determining a distribution position of the pre-contract metadata by using the conditional access system descriptor in the above, and executing a process of receiving the pre-contract metadata.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Overview (Service overview) This comprehensive data distribution service is an information (data) distribution service that can be viewed at the place where you want to see the content you want to see, and is a conventional real-time type (viewing what you are broadcasting) digital Unlike broadcasting, this service provides not only real-time delivery but also storage-based information delivery. This provides a Near Video On Demand (NVOD) -like service that allows the viewer to select and view his / her favorite content from the stored content whenever he wants. . In addition, the content is directly stored in a removable medium or an external device connected to a receiving terminal that receives the service, or the content can be viewed at a user's favorite place by copying. Furthermore, in the conventional digital broadcasting service, the content usage contract form is limited to a narrow range such as a contract on a terminal basis. However, this service provides a wide range of content usage contract forms capable of contracting on an individual user basis. .

FIG. 1 shows a service configuration diagram of the comprehensive data distribution service. Hereinafter, as an overview of the comprehensive data distribution service, a storage-type television broadcast will be described with reference to FIG. In a conventional television broadcast, a content 1 (program) sent from a broadcast side (broadcasting station) is transmitted to an antenna 2 (distribution by cable or distribution by package),
Viewing is performed from the moment when the data is received by the receiving terminal 3 and distributed by a monitor device such as the television 9 (real-time viewing 6). The storage type television broadcast in the present embodiment is:
In addition to the real-time viewing 6, a storage-type viewing 8 (such as a DVD-RAM, etc.) in which the content once distributed is stored in the storage medium 4 (a large-capacity storage medium such as a hard disk) and then viewed in the same manner as in a conventional VCR. In some cases, a removable medium 5 with high portability is used as a storage medium), and services such as real-time type + storage type viewing 7 for viewing the stored content and the distributed real-time viewing type content together are possible. It is an information distribution service.

(System Overview) FIG. 2 shows an overall configuration diagram of a comprehensive data distribution service system. As a system for providing the comprehensive data distribution service, in addition to an infrastructure using radio waves such as satellite broadcasting and terrestrial broadcasting, a service using an infrastructure using communication lines such as cable television and the Internet is possible. A case where digital satellite broadcasting using such a satellite is used as an infrastructure will be described. An overview of a system in which a comprehensive data distribution service is provided will be described with reference to FIG. The system of this comprehensive data distribution service is roughly divided into a sending side 100, a receiving side 200, a satellite line 10 using a satellite which is a transmission line connecting the sending side and the receiving side, a terrestrial line 11, a distribution network 12, and a mobile telephone network 13. It is. The receiving side 200 here is not limited to the receiving terminal 3 installed in the home 201, but also a public terminal 202 such as a vending machine, a terminal installed in a store 203 such as a convenience store, and an automobile as a mobile body. The in-vehicle terminal 204, the portable terminal 205, and the like mounted on the like are also assumed. On the sending side 100, a distribution center that produces and manages the content 1 and control information and distributes it to the receiving side 200;
A key management center for generating and managing keys used for content encryption, etc .; a customer management center for managing information on a receiving-side user; a request from a receiving-side user; a ground line 11 for collecting viewing history; , A distribution line management center that distributes (delivers) content by package media such as DVDs to users, stores, and the like.

(Service Contents) Next, services performed in the system shown in FIG. 2 will be described. In the comprehensive data distribution service, for example, the following services are enabled. -A home service mainly using the satellite digital line 10 and distributing comprehensive data of video, music, electronic magazines, games, and other video, audio, and data as digital information to the receiving terminal 3 installed in the home. 300, as in the home service, distributes data to the vending machine 202 and the retail store 203, and backs up data that cannot be stored in capacity at home, data that has not been stored, vending machines, and sales Handles data etc. that can be sold only at stores, for example, purchases electronic magazines that can be sold only at stores,
Vending machine / store service 301 for viewing at home receiving terminal 3 ・ Receiving terminal 3 at home, vending machine 202, store 203, etc. for external devices such as in-vehicle device 204 and portable terminal 205 It is possible to carry content from home and view it outside the home. For example, map data distributed to the home receiving terminal can be taken out to the in-vehicle device 204 by using a removable medium such as a DVD or an IC card in the car. A service 302 for mobiles that uses music data or removes music data by using a removable medium such as a memory card or an IC card and plays the music data with the portable terminal 205. The distribution cannot be performed by the satellite circuit 10 using the distribution network 12. Distribute contents etc. by package media such as CD-ROM, DVD-ROM and receive contents such as drama When a reservation is made from the terminal, a package delivery service 303 that distributes the content to the home by a courier service or the like from the sending side to the home on a DVD-ROM or the like. By controlling the receiving terminal in the mobile phone, for example, an EPG (Electronic Program Guide) on the screen of the mobile phone 206, a mobile phone service 304 for making a program reservation or the like to a receiving terminal at home from outside the home. The data distribution method for the service for the customer will be described.

(Rights protection method) The comprehensive data distribution service is a service for distributing contents directly to a home or the like and storing / copying / reproducing digital data in the home or the like. As a result, there will be problems related to copyrights such as data falsification, copying, reproduction, etc. beyond personal use, so it is necessary to protect and manage the copyrights of content, broadcasters, viewers, and other rights. is there.

FIG. 3 is an explanatory diagram of a right protection method in the comprehensive data distribution service. Hereinafter, a right protection method in the present comprehensive data distribution service will be described with reference to FIG. The rights protection method in the comprehensive data distribution service is a content obtained by encrypting metadata 18 storing information such as a method of presenting content to a viewer defined on the transmitting side, usage conditions, and a content encryption key. 17. Other PSI / SI (Program Specific Informa)
distribution / Service Information) 19 and the like, and the right protection function 16 (RMP (Rights Management
& Protection) function) to interpret the metadata 18
Reception control of the content 17 to the reception terminal 3, storage control for the storage medium 4 and the removable medium 5, copy control, encryption / decryption control, presentation control for a monitor device such as a TV 9, authentication control for the external device 14, and identification of an individual. Authentication / charging control for the IC card 15 for this purpose.

Next, the PSI / SI 19, the content 17, the metadata 18, and the RMP function in the receiving terminal distributed from the transmitting side will be described. First, PSI / SI is data for acquiring necessary data from a stream being distributed, like conventional digital broadcasting. This comprehensive data distribution service acquires metadata, encrypted content, etc. Use to do. Secondly, the contents in the comprehensive data distribution service means that the contents 17 stored in the storage medium 4, the removable medium 5 and the like in order to prevent data falsification and unauthorized use are basically stored in an encrypted state. Is done. The content 17 in the comprehensive data distribution service is conceptual and can be designated in a unit intended by the sending side, not in a unit indicating a constant physical quantity. Can recognize the contents. The contents can be instantly viewed by specifying the same channel as the conventional digital broadcast. Stream-based contents such as moving images mainly for real-time viewing, or temporarily stored or stored in the receiving terminal, and then viewed. It is divided into file-based contents that focus on this.

FIG. 21 is an explanatory diagram of an example of data constituting each content. In this comprehensive data distribution service, each data of a data group constituting the content is called an element. Therefore, the content refers to a set of entities, not the entity itself, as described above, and the entity is one or more elements. In the integrated data distribution service, the content, which is a set unit of the elements, is distinguished from other contents by defining a different ID for each content in a network in which the service is performed, for example, in CS digital broadcasting. Perform In this comprehensive data distribution service, as shown in the figure, the contents are classified into stream-based contents and file-based contents according to the distribution form. The contents of the elements constituting the stream contents and the elements constituting the file contents are as shown in the figure.

Third, the metadata in the present comprehensive data distribution service is used for searching for the content and structure of the content assigned to the content specified in the unit intended by the broadcaster on the transmitting side. It includes general information to be used, the method of presenting content to viewers, and the usage conditions, etc., which define the protection of copyright holders and related rights on the sending side. Is possible. So, like metadata,
Since the information to be protected is included, a part of the information is encrypted and distributed, and the data is stored in the encrypted state even when the data is stored. The metadata is classified according to distribution timing and contents. In this comprehensive data distribution service, for example, the metadata is classified into the following metadata.・ A contract code for interpreting on the receiving terminal side the broadcaster's key, which is a unique key for each pay broadcaster, and whether or not all programs broadcast by the contracted broadcaster can be viewed or partially viewed. Pre-contract metadata that is stored and delivered to the user personally and asynchronously with the delivery of the content.- The name of the content required to confirm the content to be distributed and make a viewing / storage reservation on the receiving terminal side. , Content, scheduled broadcast date, etc. are stored and distributed to all receiving terminals before distribution of the target content regardless of the user who uses the receiving terminal, mainly EPG display of the receiving terminal, viewing / storage reservation Metadata for EPG for performing, etc. ・ Information for receiving, storing, and subscribing to viewing of content is stored, and is targeted to all receiving terminals regardless of the user who uses the receiving terminal The storage / playback metadata distributed in synchronization with the delivery of the content to be stored. ・ Information on the key that encrypted the content is stored and synchronized with the delivery of the target content in the same way as the storage / playback metadata. Metadata for key distribution to be distributed and stored ・ Information for updating EPG metadata stored by using with PSI / SI, and information for acquiring necessary data from a stream group being distributed are stored , A metadata list that is constantly distributed to all receiving terminals regardless of the user who uses the receiving terminal,-Updates information common to the entire system such as a common key that is stored in the terminal in advance and is common to the entire system Metadata for system key update that stores information to be transmitted and is distributed asynchronously to the distribution of content to all receiving terminals regardless of the user who uses the receiving terminal

Fourth, the RMP function 16 is a function for controlling and managing information related to the rights of the copyright holder, broadcaster, user, and the like in the receiving terminal. FIG. 22 is an explanatory diagram showing an outline of the RMP function. Basically, control is performed based on the information in the metadata, and within the range defined on the broadcast side (allowed range), the content is decrypted, presented on the screen,
FIG. 3 illustrates an outline of functions of an RMP that performs operations such as accumulation, copying, and outputting to the outside. Each function includes reception control function, accumulation control function, copy control function, presentation control function,
Viewing contract control function, billing control function, personal authentication control function,
Key management function, profile management function, time management function, application authentication control function, external device authentication control function,
There is a communication line control function and the like.

2. PSI / SI details PSI in this comprehensive data distribution service is a TS (Transport Stream) that transmits each data on the transmission path
Since the data includes the configuration and the like, the metadata 18,
It is used to acquire the content 177 from the distribution radio wave. SI is information that indicates the contents of content and data that stores simple rights information.
Since this is data for expressing EPG, it is basically possible not to use this comprehensive data distribution service that expresses EPG by EPG metadata. Data such as PSI used in this comprehensive data distribution service is
Of the TS packet transmitting the PMT related to the broadcast program in S
A PAT (Program Association Table) for specifying a PID, a transmission path information such as a modulation frequency, and information for associating a broadcast service are transmitted, and an NIT (Netwot) indicating a configuration of the entire network is transmitted.
rk Information Table), CAT (Conditional Ac) for storing information indicating the transmission position of the pre-contract metadata, etc.
Process Table), PMT (Program Map Table) that specifies the PID of TS packets that transmit each encoded signal that constitutes a broadcast program.
ble), DII to specify the module configuration etc. in the carousel
(Download Info Indicator), DS composed of DDB (Download Data Block) that stores file type data
M-CC section (Digital Storage Media Command and
Control). The details of each data structure in the present comprehensive data distribution service will be described below.

(PAT) FIG. 4 is an explanatory diagram of the data structure and description contents of the PAT. Hereinafter, the structure of the PAT 20 will be described with reference to FIG. The PAT is transmitted by a TS packet of PID 0x0000, is present for each TS, and is data indicating the configuration of a service distributed in the TS. The data included in the PAT 20 includes table_id (0x0) for identifying the PAT on the receiving terminal side.
0), information indicating data length, transport strea to be delivered
m (TS) ID, program_number (service_id) for identifying a service to be delivered in the TS, and TS for transmitting a PMT storing information in the service corresponding to the program_number
It is composed of the PID of the packet and the like. PAT is data required to receive content and metadata,
After receiving the content and the metadata, the data becomes unnecessary and may be temporarily stored in a non-volatile memory (RAM) or the like on the receiving terminal, but is basically not stored.
In order to realize the present comprehensive data distribution service, the PAT 20 currently specified by the BS digital broadcasting standard or the like is not particularly extended.

(NIT) FIG. 5 is an explanatory diagram of the data structure and description contents of the NIT. Hereinafter, the structure of the NIT 21 will be described with reference to FIG. The NIT is data that is transmitted by a TS packet of PID 0x0010 and indicates information on the entire network in which an integrated data distribution service that exists in common for each TS is performed. The data included in the NIT 21 includes a table_id for identifying the NIT on the receiving terminal side, information indicating a data length, a network_id indicating which network is described, a network descriptor describing a network name, and a CA_EMM_TS descriptor. , A system management descriptor for identifying whether data transmitted on the network is broadcast or non-broadcast, transport_stream_id indicating the configuration of TS included in the network, each TS
It includes parameters such as service configuration, service list descriptor indicating service type, radio wave polarization plane, frequency, satellite orbit position used, and modulation method required for receiving terminal to acquire each TS. It is composed of a satellite distribution system descriptor and the like.

Since the NIT 21 is data that is updated only infrequently, it may be stored in the receiving terminal in order to improve the processing speed of the receiving terminal. Like PAT, no special storage is required. A part of the data in the service list descriptor 22 is an extension of the NIT 21 which is currently specified in performing the present comprehensive data distribution service. The extension of the service list descriptor is that information indicating a storage type service which is a feature of the comprehensive data distribution service is newly added to the service type specified in the service list. This makes it possible to mix a comprehensive data distribution service with an existing broadcasting service in any network, for example, a BS digital broadcasting network, a terrestrial digital broadcasting network, or a CS digital broadcasting network. Also, the channel (servi
When (ce_id) is specified, it is possible to recognize that it is a comprehensive data distribution service, and it is necessary to identify which of the receiving process of the comprehensive data distribution service and the receiving process of the existing type, for example, BS digital broadcasting, should be performed It is possible to separate the processing to realize a receiving terminal that can receive both the existing type service and the comprehensive data distribution service,
Consistency with existing services and integrated data distribution services can be achieved.

FIG. 23 is an explanatory diagram of the types of services currently specified. Currently undefined as an extension,
Or the operator defined 0x03-0x7F, 0x80-0xA0, 0x
A new storage type service (with a right protection function) is newly defined in A9-0xBF and 0xC1-0xFF. However, when the storage type service is considered to be a part of the data broadcasting, it is also possible to apply the data service for pre-storage of the 0xA8 portion currently specified.

(CAT) FIG. 6 is an explanatory diagram of the data structure and description contents of CAT. Hereinafter, the structure of the CAT 23 will be described with reference to FIG. The CAT 23 is transmitted for each TS by a TS packet of PID0x0001, and within each TS, the EM relating to conditional access is provided.
When transmitting M, if TS packet transmitting EMM
The conditional access system descriptor indicating the PID, the organization channel of the paying entity operating the automatic display message, and a CA service descriptor for controlling the display of the message are included. Basically, CAT23 is not extended from the existing broadcasting standard. However, in this comprehensive data distribution service, the above-mentioned pre-contract metadata is transmitted as EMM,
It is possible to specify the EMM that stores the metadata for pre-contract in the operation method of the conditional access system descriptor.

(PMT) The structure of the PMT 24 will be described with reference to FIG. The PMT 24 is transmitted by a TS packet identified by a PID specified in the PAT 20, has a table of the number of services distributed in each TS, and transmits each encoded signal constituting a broadcast program in each service. PI of TS packet
Due to the feature of designating D, the information is data that differs for each service, and is data indicating information about the service being distributed. The data included in the PMT 24 includes table_id for identifying the PMT on the receiving terminal side, information indicating the data length, program_number (service_id) for identifying which service is described for the service, and ECM for the entire program. Conditional reception system descriptor for specifying the PID of the TS packet to be transmitted, digital copy control descriptor for specifying the copy control information for the entire program, emergency information descriptor for specifying the distribution location of the emergency broadcast program, distribution in progress Steam_type that specifies the format of each stream that composes the service, ES that identifies the TS packet in which each stream is stored
_PID, stream identification descriptor for tagging each stream, hierarchical transmission descriptor for specifying the relationship between layered streams, digital copy control descriptor for specifying copy control information for each stream, and ES A target area descriptor that specifies a possible area, a video decode control descriptor that specifies a video code, and a data code that specifies a data signal format for identifying a stream that transmits metadata or a stream that transmits content Format descriptor, ECM for each stream
, And a content use information descriptor 65 for indicating the position of metadata for each stream. The PMT basically does not accumulate because the contents are different for each time frame in which the service is distributed, and when the PMT information becomes necessary, it acquires the information from the radio wave being directly distributed each time.

[0024] In carrying out this comprehensive data distribution service, PMT
The parts to be extended in 24 include a digital copy control descriptor 25, a stream_type 26, a stream identification descriptor 2
7, the data definition part 65, the content usage information descriptor 65
It is. As an extension of the digital copy control descriptor 25, copy control and the like in the present comprehensive data distribution service are basically performed in the content usage information descriptor or metadata specified by the content usage control descriptor 65. This is to raise the priority of the content use information descriptor 65 over the control descriptor. As a result, it is possible to separate copy control using metadata, copy control using only the digital copy control descriptor of the existing type service, etc., and consistency with the comprehensive data distribution service and the existing type service.

FIG. 24 is an explanatory diagram of the stream format currently defined. The extension of the Stream_type 26 part is to add a new format to an undefined part or a user area when a stream of a new format is used in a comprehensive data distribution service with respect to a stream currently specified. This allows the receiving terminal that receives the comprehensive data distribution service to recognize the newly defined stream format.

FIG. 25 is an explanatory diagram of currently defined tag values. As an extended part of the stream identification descriptor 27, compon for tagging the stream
This is to add a new tag to the ent_tag part. On the receiving terminal side, by recognizing the value of this tag, the tagged stream identifies a stream for transmitting video, a stream for transmitting audio, a stream for transmitting data, a default stream which is a stream to be presented first, and the like. Operate.

FIG. 26 is an explanatory diagram of an example of a tag defined in the present comprehensive data distribution service. In this comprehensive data distribution service, a new definition is made in the reserved area in FIG. 25, and the receiving terminal operating based on the tag value can be controlled from the broadcasting side. Since the tag value defined in the existing service is a meaning for viewing in real time, when distributing the storable content which is a feature of the comprehensive data distribution service, the tag value defined in FIG. 26 is used. By using it, existing type receiving terminals without rights protection function will not be able to recognize the stream to distribute the content, while receiving terminals that can receive this comprehensive data distribution service will be able to recognize the storage type stream. Thus, it is possible to separate the existing service from the comprehensive data distribution service and to ensure the consistency. The receiving terminal for the comprehensive data distribution service is different from the existing receiving terminal that directly performs the operation of acquiring the content. When the tag value indicating each metadata is specified, the receiving terminal obtains the metadata first. The processing is controlled according to the content of the metadata. If the tag value indicating the metadata and the tag value for storage are not specified, the operation of directly acquiring the content is performed as in the case of the existing receiving terminal.

(DSM-CC section) Next, DII and DDB constituting a carousel stream for transmitting each element constituting metadata and file-based contents will be described. In the carousel transmission method in the MPEG2 transmission standard, information on data and control information at the time of acquisition are embedded in a carousel stream of DDI. Since the receiving operation is performed after acquiring this information, the distribution cycle is set to be very short. The actual file is
DDB is divided into blocks called DDB and distributed.
The block of DII is inserted into the stream of the block in accordance with the distribution cycle. Also, an aggregate with a DDB is defined as an intermediate aggregate called a module. The intermediate aggregate is an aggregate that can be defined on the sending side and exists as an arbitrary unit. Metadata is also divided into DDBs for distribution as one file and sent in the same way. As for the information on the metadata file, simple information is defined in the DII, but the detailed information is defined as one file as a metadata list. This metadata list is also 1
Since it is defined as one file, it is distributed to DDB and distributed. However, in the present embodiment, as an example, the metadata list is necessary information first in the receiving operation, and thus is defined as a module 0, which is a block that is first assembled in the receiving operation.

(DII) FIG. 8 is an explanatory diagram of the data structure and description contents of DII. Hereinafter, the structure of DII will be described with reference to FIG. DII28 is a stre specified in PMT24
It is transmitted by a TS packet identified by ES_PID of a stream whose am_type is a carousel. The DII 28 is information indicating a module configuration in the carousel and is data existing in each carousel stream. Data included in DII 28 is table_i for identifying DII on the receiving terminal side.
d, download_id to distinguish it from other carousels,
Block_size to specify each block size of DDB,
TCDownloadScenario that specifies the timeout value from the start to the end of the carousel download, number of Modules that indicates the total number of modules in the carousel, module_id that identifies each module, module_size that specifies the size of each module, and identifies the update of each module mod
ule_version, module_ that specifies information for each module
It is composed of info_byte and so on.

FIG. 27 is an explanatory diagram of information specified in Module_info_Byte. On the receiving terminal side, the data structure itself is not required in the present comprehensive data distribution service, except that the module in which the module_id in the carousel is specified by 0x00 is always obtained first.

(DDB) FIG. 9 is an explanatory diagram of the data structure and description contents of the DDB. Hereinafter, the structure of the DDB 29 will be described with reference to FIG. DDB29 is PMT2 like DII28.
The stream_type specified in 4 is transmitted by the TS packet identified by ES_PID of the stream that is a carousel, and is transmitted by the TS packet of the same PID as DII.
Is a plurality of data in one carousel for dividing and transmitting the module defined by. DD
The data included in B29 is table_id for the receiving terminal to identify DDB29, which module is divided into blocks.
It is composed of a module_id for designating a DDB, a module_version which is an update number of the module, a Block_number indicating a position of a block constituting the designated module, a Block_data for storing data itself obtained by dividing the module into blocks, and the like. The data structure itself does not need to be particularly extended in this comprehensive data distribution service.

3. Metadata and Content (Details of Metadata) Next, the metadata 18 generated on the transmitting side and distributed to the receiving terminal will be described. Figure 1
FIG. 0 shows an explanatory diagram of the classification of metadata. Hereinafter, the metadata 18 in the comprehensive data distribution service will be described with reference to FIG. The description method of the metadata in this comprehensive data distribution service can be described in a text format such as XML or in a binary format such as PSI / SI. However, the parts that need to be encrypted are described in binary format, especially for the purpose of improving the description interpretation processing in the receiving terminal. Operation by text description is also possible. Metadata is classified according to the contents described and the distribution timing as described above. First, as items that are broadly classified, metadata 30 attached and distributed to the user and metadata 31 attached and distributed to the content are separated. As the metadata 30 attached to the user and distributed for each user, the above-described pre-contract metadata 32 corresponds. Information stored in the pre-contract metadata includes, for example, a different user ID for each user, a unique terminal ID for each terminal owned by the user, an ID of a paying entity contracted by the user, and a contract signed by the user. A contract code such as tier / flat indicating the form, information on the contract such as the number of points used by the user, other personal information of the user, and the like are stored, and necessary portions are encrypted with a terminal key Kmc37 unique to each terminal.

The metadata attached to the content and transmitted without discrimination among all users is composed of a program table for a predetermined period such as one week determined by operation on the receiving terminal irrespective of the content being distributed. , EPG metadata 33 used for content reservation and the like, and content usage metadata 34 storing usage restriction information of the content being distributed. The EPG metadata 33 is information required for the EPG to be displayed on the EPG, such as the title, contents, and genre of the content, information required for the reservation, such as the scheduled broadcast date, start time, duration, and the capacity of the content. It consists of user access control information and the like for judging whether or not it can be used with a contract concluded by the user. If encryption is necessary, a system key Ksy3 common to all receiving terminals is used.
8 and distributed. The purpose of encryption with a common key for all receiving terminals is as follows:
EPG is for making it possible for all users to view. E
For PG metadata, use existing standards
It is also possible to substitute EIT (Event Information Table). The content use metadata 34 is used in conjunction with the storage / playback metadata 36 for searching for content at the time of playback after storage and for confirming content usage restrictions and the like, as well as the pre-contract metadata described above. It is classified into metadata 35 for key distribution for performing conditional access in the data distribution service. The storage / playback metadata 35 is metadata for extending and detailing the EPG metadata for the content currently being distributed in the EPG metadata. The content includes information such as the title, content, and genre of the content required at the time of search, broadcast date, start time, duration, information required when managing in the storage medium such as content capacity, target age, and region. User access control information such as restrictions, paid business entity IDs to identify available users, target contract codes, copy prohibition, copy control information such as only one generation is possible, content expiration date, validity time, etc. Control information, contract form such as purchase and rental required for viewing contract, contract period, billing method, billing fee, etc., other encryption method, key I
It is composed of information such as D, type, and the like, and a necessary part is encrypted by a content-specific key Kk40 and distributed. The key distribution metadata 35 is storage control information for determining whether the content can be stored upon receiving the content, the age for determining whether the user uses the content, the target area, the paying entity ID, and the target contract. It is composed of user access control information such as a code, key information for encrypting the content, and the like, and necessary portions are encrypted and distributed. As a key for encrypting the key distribution metadata, in the case of content distributed by a paying entity that requires conditional access or the like, the content is encrypted with a unique company key Kw39 for each paying entity, and all users In the case of the target free contents, etc., the system key Ksy3 common to all the receiving terminals described above is used.
8 and distributed. The above is the classification of metadata in the present comprehensive data distribution service.

(Details of Content) Next, the content 17 will be described. As described above, this comprehensive data distribution service is classified into stream-based contents and file-based contents according to the distribution form. The contents of the elements constituting the stream contents and the elements constituting the file contents are as shown in Table 1. In addition, various methods for realizing the ID of the content that is unique in the network are possible depending on the operation. For example, there is an ID that identifies each broadcasting station or content provider, followed by adding numbers assigned sequentially in each broadcasting station and content provider, or a method to create a serial number instead of a serial number Time and time of delivery, method to be realized by adding relative number in delivery content, etc., information for identifying each service, network identification information, so that it is unique within each service There is a method of giving a managed ID.

FIG. 11 is an explanatory diagram of an example of a content configuration in a service. Hereinafter, the contents in the comprehensive data distribution service will be described with reference to FIG. The content is composed of one or more elements as described above. This figure is a diagram showing the content structure of a certain program 45 in the service 41 which is a certain channel. The data structure of the program 45 is described in the PMT as described above, and the license of each content described in the PMT is described. Metadata, which is information, is attached to each stream constituting a program by a content use descriptor, so that the content is actually a stream unit or more. For example, video stream ES1_42, audio stream ES
2_43, data carousel ES3_ which is a data stream
When the content 1_45, which is one content, is configured from the content 44, the same metadata is referred to by a content usage descriptor stored in an area describing the content of each of the ES1, ES2, and ES3 in the PMT. Also, for example, in the case of the content 2_46, which constitutes the content in one stream, the metadata specified by the content usage descriptor to be stored in the area describing the content of the ES4 in the PMT is stored in another ES.
It is realized by not referring to from. In this comprehensive data distribution service, when the content is composed of one element as a unit intended by the broadcaster, one element exists in one stream as in ES4_46, and when the content is composed of a plurality of elements, one element as in ES3_44. If there are multiple elements in the stream, or
By configuring the content by a plurality of streams as in -45, the content unit can be operated flexibly.

4. Delivery System (Stream Content) (Stream Configuration) FIG. 12 is an explanatory diagram of the stream configuration in the TS. Next, a stream image transmitted in each TS in the comprehensive data distribution service will be described with reference to FIG. In digital satellite broadcasting, all data
It is stored and delivered in the payload (data storage part) of the TS packet. The PID value stored in the header of the packet differs depending on the data stored in the TS packet. In satellite digital broadcasting, it is a method of multiplexing and distributing TS packets consisting of a plurality of PIDs. Each ES (elementary stream) shown in FIG. 12 is obtained by connecting TS packets having the same PID value in the time axis direction, and each TS is composed of a plurality of ESs as shown in FIG. TS48 is multiple TS
It is information indicating a set when multiplexed by packets, and is a unit that is grouped into units such as one broadcast station. A TS may be configured by a plurality of broadcasting stations depending on the operation, but in the present invention, a description will be given as a unit grouped for each broadcasting station. For example, in the case of BS digital broadcasting, 1
Since a plurality of broadcasting stations exist in one network, the network is constituted by a plurality of TSs. each
As an ES that is similarly operated for each TS, a NIT stream 49 based on NIT, which is common information in each TS indicating a network configuration, services such as pay broadcasting in each TS are performed, and metadata for pre-contract is provided. That exists when is delivered
A CAT stream 50 by T, a PAT stream 51 by PAT that stores the delivery position of PMT indicating each service delivered in each TS, a pre-contract metadata stream 52 that stores pre-contract metadata for each user, An EPG metadata default stream 53 that stores and distributes EPG metadata, an EPG metadata stream 54, and the like.

As described above, EPG metadata can be replaced by EIT or the like in the existing standard. However, in the present invention, EPG metadata, which is a file having high storage performance in a storage medium, is distributed in a data carousel format. explain. EP
The G metadata stream exists when performing a service for distributing an integrated data distribution service, and may not exist for a TS that distributes only existing service contents. The metadata stream for EPG is the selected TS
EPG metadata (contents EPG metadata 61 for other stations) as well as EPG metadata (contents EPG metadata 60 for own station) for contents within
For example, to distribute EPG metadata for content to be distributed for one week specified by the service and operation, and EPG metadata for content to be distributed for one week or more specified by the provider, etc. It can be composed of streams. However, in order to improve the process of recognizing the distribution position of the EPG metadata of the receiving terminal, the EPG is stored in module 0 which is the start-up module in the EPG metadata default stream 53 which is first obtained by the receiving terminal among a plurality of streams. And stores the metadata list 58 for distribution. The EPG metadata list 58 is list information that describes the distribution position of the metadata for the content, and is used when the EPG metadata in the distribution stream is updated with respect to the EPG metadata stored in the receiving terminal. Contains information for storing difference metadata. For example, attribute information of a metadata list such as a version for identifying update of information on the receiving terminal side, ID information for identifying each content, information indicating content to be first presented in each service, corresponding metadata ID, component_ta indicating the distribution position
g, module_id, and list information such as a version number for detecting an update of each EPG metadata.
As described above, the metadata stream for EPG is distinguished from other streams by the com in the stream identification descriptor in the PMT.
It is identified by the tag value of ponent_tag or a fixed PID value by operation. In the case of identification using a fixed PID value, the EPG metadata list 58 can be acquired at certain fixed intervals when the receiving terminal is started, so that the acquisition performance of EPG metadata can be improved.

Next, a stream operated for each service 41 will be described. The streams transmitted by each service include a PMT stream 55 by PMT indicating the data configuration of the service being distributed, a stream 57 for content distribution, and the above-described content use metadata 62 existing when the content is a comprehensive data distribution service content. It is composed of a content use metadata stream 56 to be distributed. The content distribution stream may be a plurality of streams depending on the amount of content distributed in the service 41. As for the content use metadata stream 56, basically only the metadata for the content currently being delivered in the service is delivered, and the content use metadata list 59 is not used because the delivery position is indicated by the content use information descriptor in the PMT. However, if metadata is to be distributed for the content to be distributed next time by operation, the content usage metadata stream is composed of multiple streams.
It is also possible to operate a metadata list in the same manner as the G metadata stream.

(Content Receiving Image) FIG. 13 is an explanatory diagram of a content receiving processing image. Next, an image of actually receiving content from these distribution streams will be described with reference to FIG. Receiving content in this comprehensive data distribution service basically means registering reservation information from EPG using EPG metadata, EIT in SI, etc. and receiving it from reservation information, or receiving content directly by remote control , But the basic operation is common in both cases. The reservation information referred to here is, for example, a scheduled broadcast date and time, a duration,
This is information constituted by a network ID, a service ID, a content ID, a corresponding component tag value, a content capacity, and the like. Therefore, content reception is performed by specifying the network ID, service ID, and content ID from the receiving terminal side. The receiving terminal first receives the NIT 21 from the stream group in the TS being presented or set as an initial value, and recognizes the distribution position of the TS to which the service ID of the requested channel is distributed. Next, the receiving terminal
Set the tuner to the recognized TS, and set CAT23
Is determined to be present. If the CAT23 is distributed, the receiving terminal side distributes the precontract metadata to be preferentially acquired, so that the precontract metadata acquisition processing is performed. The distributed PAT 20 is received, and the distribution position (PMT_PID) of the PMT 24 indicating the data configuration in the requested channel is acquired. The receiving terminal then proceeds to the acquired delivery location (PMT_PID)
The PMT 24 receives the PMT 24, obtains the distribution position (ES_PID) 63 of the requested content, identifies whether the content can be stored by the content use descriptor 65, identifies the corresponding metadata distribution position 64, and determines that the content can be actually received. Become.

(Details of Content Usage Information Descriptor) FIG.
FIG. 3 shows an explanatory diagram of the structure in the content usage information descriptor. Next, information stored in the content usage information descriptor will be described with reference to FIG. The content usage descriptor 65 is an area for storing the storage availability information 66 of the content, an area for storing the information 67 on the metadata distribution method, and a comp for identifying the ES transmitting the metadata.
The PMT includes an area for storing the onent_tag value, an area for storing the module_id that is the distribution position of the corresponding metadata, and an area for describing the content ID and the like for each ES.
It is possible to determine whether or not the content can be stored at the stage of receiving the content, thereby improving the performance of acquiring the content.

5. Reception Processing (PSI, PMT) (PSI Processing) FIG. 15 is an explanatory diagram of the PSI reception processing. Next, details of the above-described reception processing on the receiving terminal side will be described with reference to FIG. In the receiving terminal, when the PSI receiving process displays the default channel on the TV at the time of starting the receiving terminal as described above in the content receiving process, when the user selects the content being distributed by EPG, the channel, when the channel is directly specified by the remote control,
Reservation information or the like is used as a start 70 trigger. Therefore, in the tuner part in the receiving terminal, the process is started 70 from a state in which parameters such as a receiving frequency for receiving the default TS are set. In the PAT reception 71, the PID is set to 0x0 to check whether data for the selected channel and content is distributed in the TS that is set as a default.
PA received TS packet (PAT stream) sent by 000
Assemble T. In the Service_id search 72, information on the channel and content selected in the assembled PAT, that is, whether the channel and content selected in the set TS are distributed. When the receiving terminal is started, referring to Program_number in FIG. 4, there is basically a selected channel, seivice_id, in the PAT for selecting a default channel. Here, when the selected channel exists, the process proceeds to a PMT receiving process 77 described later. On the other hand, if the information for the selected channel does not exist in the PAT, the receiving terminal determines that the service of the selected channel is not being performed in the set TS, and the channel selected in which TS is distributed. NIT reception 73 is performed in order to recognize whether or not it has been performed. It is also possible to omit the operation before receiving the NIT by operation. NIT is a TS packet with PID of 0x0010 and is distributed commonly to all TSs, so the receiving terminal is set
The TS packet having the PID of 0x0010 is received in the TS, and the NIT is assembled. After assembling the NIT, the TS through which the selected channel is distributed is identified 74 by the service list descriptor 22 in the NIT as shown in FIG. At this time, the type of service performed on the channel selected at this time can also be identified.If a service type other than the storage type service, which is a feature of this comprehensive data distribution service, is specified, it is currently specified in the standard. The existing reception process 80 is performed. On the other hand, if the storage type service is set, the reception processing in the comprehensive data distribution service is performed, and the information of the service distribution TS identified by the service list descriptor 22 in the NIT and the setting of the satellite distribution system descriptor are performed. The parameter information for changing the set TS to the service delivery TS is acquired, and the parameter is set to the tuner of the receiving terminal. When the tuner of the receiving terminal is set to the service delivery TS, the pre-contract metadata to be preferentially acquired by the receiving terminal in the TS is transmitted by a TS packet of PID 0x0001 in order to identify whether the metadata is distributed. 75 to identify if a CAT exists. CAT
If there is a TS packet for transmitting, the receiving terminal executes the pre-contract metadata receiving process 79. If the CAT does not exist, receive the TS packet distributed with PID 0x0000 in the TS set as in operation 71,
The PAT in the set TS is received (76). Upon receiving the PAT, a TS packet of the PID specified by the PMT_PID corresponding to the selected channel stored in the PAT is received, and the PMT in which information of the selected channel is described
Assemble 77. Analysis of the last assembled PMT 7
In step 8, the receiving terminal selects the next receiving processing flow to be performed. Depending on the operation, the presence / absence confirmation process 75 of the CAT may be performed before the PAT reception 71 or may be omitted. The above is the PSI receiving process in the present comprehensive data distribution service.

(Pre-Contract Metadata Receiving Process) FIG.
FIG. 8 shows an explanatory diagram of the reception processing of the pre-contract metadata.
Next, the pre-contract metadata receiving process 79 when a CAT exists in the TS will be described with reference to FIG. In the pre-contract metadata receiving process, the TS packet transmitted by PID0x0001 is received and the CAT is assembled 81 as described above. Next, the pre-contract metadata stream is received using the ES_PID of the TS packet that transmits the pre-contract metadata stream specified by the conditional access system descriptor stored in the assembled CAT 82. On the receiving terminal side
It is determined whether information addressed to the terminal itself exists in the pre-contract metadata stream received based on the terminal ID, personal ID, and the like stored in the RMP 83. Terminal ID, personal I held by RMP
If there is no prior contract metadata for D, the process ends 85 and the PAT reception 76 in the PSI process is restarted. If the corresponding pre-contract metadata exists, the pre-contract metadata is transferred 84 to the RMP, and the PAT reception 76 is similarly restarted. Depending on the processing performance of the receiving terminal, this pre-contract metadata reception process and the PSI
If the processing can be executed in parallel, only the pre-contract metadata processing may be terminated. The RMP side decrypts the received prior contract metadata with the terminal key Kmc that owns it and stores necessary information in an IC card, a profile in the RMP, or the like.

(Content Storage Image) FIG. 17 is an explanatory diagram of an image during content storage. Next, an image of content storage performed by the PMT analysis processing 78 will be described with reference to FIG. On the receiving terminal side, if the storability is described in the storability information of the content stored in the content usage information descriptor 65 in the PMT 24, the content 17 which is the corresponding stream, the corresponding stream specified by the content usage information descriptor The storage / playback metadata 36 in the content use metadata is temporarily stored in the work area in the storage medium, and the remaining key distribution metadata 37 in the content use metadata is passed to the RMP. All stored receiving terminals decrypt with the common system key Ksy, and for pay broadcasting, decrypt with the different business key Kw for each business stored in the RMP, and contract in the pre-contract metadata described above. The information is compared with the target contract information stored in the key distribution metadata.
The contents temporarily stored and metadata for storage and reproduction are formally stored 87 in FIG. The above is the storage image of the content in the present comprehensive data distribution service. Next, the detailed operation in the receiving end at the time of actual accumulation will be described as PMT analysis processing.

(PMT Analysis Process) FIG. 18 is an explanatory diagram of the PMT analysis process. PMT in this comprehensive data distribution service
The analysis process 78 will be described with reference to FIG. On the receiving terminal side, stream-type2 stored in the above-mentioned ES_info in the PMT
6. The description area of the component constituting the corresponding content is confirmed by the stream identification descriptor 27 (content use descriptor 65) and the like 88. Next, the content usage descriptor 65 written in the component description area is checked 89, and it is determined whether a component constituting the content, that is, a stream can be stored.
0. If it is described that storage is not possible, the storage process is terminated because the component is dedicated to real-time viewing / listening 9
3. If the content is not encrypted, the received content is transferred to the decoder in the receiving terminal in the same manner as the existing type, and if the content is encrypted, the content is transferred to the RMP. On the other hand, if the storage is possible, the metadata delivery position stored in the content usage descriptor 65 is extracted 91 and the storage processing 9
Do 2

(Accumulation Processing) FIG. 19 is an explanatory diagram of the accumulation processing. Next, the accumulation process 92 will be described with reference to FIG. In the accumulation process, a stream for distributing the content is received by the ES_PID of each stream constituting the corresponding content stored in the PMT 94, and the corresponding content use metadata distribution positions extracted in the PMT analysis process are component_tag and module_id. The content usage metadata is further received and temporarily stored together with the content in the work area of the storage medium 95. Next, the receiving terminal extracts the key distribution metadata in the content usage metadata by using the distributed resource list stored in the module, and
A determination is made as to whether the content is passed to P and the user access is permitted 96. In the RMP, user access information is determined by comparing the user's contract information or the like sent as pre-contract metadata with target contract information or the like in the key distribution metadata. The RMP may make this determination based on, for example, whether or not the system key ksy or the operator key Kw is held. If the access is not possible, the temporarily stored contents and metadata are deleted 98, and if the access is permitted, the contents and metadata are formally stored.

(Name Space) FIG. 20 is an explanatory diagram of the name space at the time of accumulation. Next, the name space in the receiving terminal when formally storing data will be described with reference to FIG. In this comprehensive data distribution service, the service that links the content in the storage medium to the content being distributed (the above-described real-time type + storage type service) is performed. It is necessary to accumulate in the same namespace as the position at the time of distribution specified in. Therefore, the namespace at the time of accumulation is the network ID
310, TS_ID 311, service ID 312, content I
D313, component tag 314, module name 3
15, and the resource name 316 is specified in this order.
The module name corresponds to module_id in the carousel at the time of distribution, the resource name is the name of each element, the metadata ID corresponds to storing metadata, and the resource assigned to each element on the sending side The name of the resource list in the list, or movie.mpeg2-video, which is the name given by the module name descriptor, corresponds to this. With the above arrangement, the position of the content already distributed can be recognized on the transmission side, and a link or the like from the content for real-time viewing / listening becomes possible. The data distribution method in the present comprehensive data distribution service has been described above.

[0047]

According to the present invention, the meta data defining the usable range of the content is attached to the transmission side for each content, and distributed together with the content to the reception side, so that the range defined in the meta data at the reception side is obtained. , And a method of presenting content to the user can be finely controlled. Therefore, according to the present invention, it is possible to provide a service capable of protecting the right of the content, protecting the individual right of the user, and the like.

[Brief description of the drawings]

FIG. 1 is a service configuration diagram of a comprehensive data distribution service.

FIG. 2 is an overall configuration diagram of a comprehensive data distribution service system.

FIG. 3 is an explanatory diagram of a right protection method in an integrated data distribution service.

FIG. 4 is an explanatory diagram of a data structure and description contents of a PAT.

FIG. 5 is an explanatory diagram of a data structure and description contents of a NIT.

FIG. 6 is an explanatory diagram of a CAT data structure and description contents.

FIG. 7 is an explanatory diagram of a data structure and description contents of a PMT.

FIG. 8 is an explanatory diagram of a data structure and description contents of DII.

FIG. 9 is an explanatory diagram of a data structure and description contents of a DDB.

FIG. 10 is an explanatory diagram of metadata classification.

FIG. 11 is an explanatory diagram of a content configuration example in a service.

FIG. 12 is an explanatory diagram of a stream configuration in a TS.

FIG. 13 is an explanatory diagram of a content reception processing image.

FIG. 14 is an explanatory diagram of a configuration in a content usage information descriptor.

FIG. 15 is an explanatory diagram of a PSI receiving process.

FIG. 16 is an explanatory diagram of a process for receiving metadata for advance contract.

FIG. 17 is an explanatory diagram of an image when storing content.

FIG. 18 is an explanatory diagram of a PMT analysis process.

FIG. 19 is an explanatory diagram of a storage process.

FIG. 20 is an explanatory diagram of a namespace at the time of accumulation.

FIG. 21 is an explanatory diagram of an example of data constituting each content.

FIG. 22 is an explanatory diagram of an outline of an RMP function.

FIG. 23 is an explanatory diagram of a currently defined service type.

FIG. 24 is an explanatory diagram of a stream format currently specified.

FIG. 25 is an explanatory diagram of currently defined tag values.

FIG. 26 is an explanatory diagram of an example of a tag defined in the comprehensive data distribution service.

FIG. 27 is an explanatory diagram of information specified in Module_info_Byte.

[Explanation of symbols]

1 content, 2 receiving antenna, 3 receiving terminal, 4
... storage media, 5: removable media, 6 ... real-time viewing, 7 ... real-time + storage viewing, 8 ... storage viewing, 9 ... television, 10 satellites, 11 ground lines,
12: distribution network, 13: mobile phone network, 14: external equipment, 1
5: IC card, 16: RMP function, 17: encrypted content, 18: encrypted metadata, 19: PSI / SI, 20: PA
T, 21 ... NIT, 22 ... TS descriptor for system key update, 23
... CAT, 24 ... PMT, 25 ... Digital copy control descriptor,
26 ... stream_type, 27 ... stream identification descriptor, 2
8: DII, 29: DDB, 30: User unit, 31: Content unit, 32: Pre-contract metadata, 33: EPG
Metadata for use 34, content use metadata, 35
... Key distribution metadata, 36 ... Storage reproduction metadata,
37 ... terminal key Kmc, 38 ... system key Ksy, 39 ... business key Kw, 40 ... content key Kk, 41 ... service, 42 ...
ES1, 43: ES2, 44: ES3, 45: Content 1, 4
6 ES4, 47 Content 2, 48 TS, 49 NIT stream, 50 CAT stream, 51 PAT stream, 52 ... Stream for pre-contract, 53 ... Metadata default stream for EPG, 54 ... Metadata for EPG Stream 55 55 PMT stream 56 content metadata stream 57 content distribution stream 58 EPG metadata list 59 content metadata list 60 own EPG metadata 61 Station EPG metadata, 62: Content usage metadata, 63: ESxx, 64: Content usage metadata stream, 65: Content usage information descriptor,
66: Content storage availability information, 67: Transmission method identification information, 68: ES identification information, 69: Metadata storage location information, 70: Start, 71: PAT reception, 72: Service_id search, 73: NIT reception, 74: service_type / TS identification, 75
... CAT existence / absence, 76 ... PAT reception, 77 ... PMT reception, 78
… PMT analysis, 79… Pre-contract metadata reception processing, 8
0: Existing type reception processing, 81: CAT reception, 82: Pre-contract metadata ES reception, 83: Corresponding pre-contract metadata identification, 84: Transfer to RMP, 85: Processing end, 86:
Work area, 87: Content storage area, 88: Extract component description area, 89: Check content usage information descriptor, 90: Accumulation determination, 91: Extract metadata distribution position, 92: Accumulation processing, 93 ... End, 94 ...
Receives the specified stream, temporarily stores it in 95… HDD,
96: confirmation of key distribution metadata; 97: accumulation; 98: erasure; 100: transmission side; 200: reception side; 201: home;
202: vending machine, 203: store, 204: mobile terminal, 205: portable terminal, 206: portable telephone, 300 ...
Home service, 301: vending machine / store service, 302: mobile service, 303: package delivery service, 304: mobile phone service, 310: network ID, 311: TS_id, 312
... Service ID, 313 ... Content ID, 314 ... Component tag, 315 ... Module name, 316 ... Resource name

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/173 640 H04L 9/00 601B (72) Inventor Tetsuya Ohashi 4-6-6 Kanda Surugadai, Chiyoda-ku, Tokyo 5C064 BA07 BB01 BB02 BB10 BC03 BC06 BC18 BC20 BC23 BC25 BD08 BD09 5J104 AA16 BA03 EA16 NA02 PA04 PA05 PA11 5K028 BB05 EE05 KK12 KK32 RR02

Claims (11)

[Claims] Claims 1. A content is distributed using a communication line or a media medium, and a content encrypted on a transmission side is stored in an encrypted state on a reception side, and the content distributed from the transmission side together with the content when the content is used. Metadata that stores information related to the content, including information on the presentation method, usage conditions, and content encryption key, enables the receiving side to determine the use of the content, thereby enabling charging control and / or rights protection for the content. A transport stream (TS) grouped in one or a plurality of broadcast units is distributed, and a plurality of elementary streams (E) included in each TS are distributed.
S) is a distribution position of a NIT stream based on a network information table (NIT), which is common information in each TS indicating a network configuration, and a program map table (PMT) indicating each service distributed in each TS. A PAT stream based on a program identification table (PAT) storing pre-contract metadata streams storing pre-contract metadata for each user, and limited services including pay broadcasting in each TS are performed. Access control (CAT) including a conditional access system descriptor indicating the identifier of the TS packet related to conditional access, which is present when the
An AT stream, wherein the receiving terminal obtains the distribution position of the pre-contract metadata using the conditional access system descriptor in the CAT, and executes a process of receiving the pre-contract metadata. 2. The data distribution method according to claim 1, wherein the receiving terminal has a designated network ID and service I
NI indicating the configuration of the entire network by associating transmission path information with a broadcast service from a stream group in a transport stream (TS) being presented or set as an initial value by D and / or content ID
Receiving the T, and the receiving terminal recognizes the distribution position of the TS to which the requested service ID is distributed based on the NIT received in the receiving step, and preferentially acquires the TS in the recognized TS. Determining whether there is a CAT including information indicating the transmission position of the pre-contract metadata to be transmitted; and when the receiving terminal determines that the CAT is distributed in the above-described judgment step, Obtaining the data. 3. The data distribution method according to claim 2, wherein the receiving terminal determines that the CAT does not exist in the determining step, and the PMT distribution position indicating the data configuration in the requested channel. Receiving a PAT containing
A data distribution method, further comprising a step of controlling storage and / or reception of content by acquiring a PMT by a PAT. 4. The data distribution method according to claim 1, wherein the receiving terminal confirms whether data for the selected channel or content is distributed in a default TS. PA receiving TS packet
A PAT receiving step for assembling the T; a receiving terminal, a service identifier searching step for identifying whether information about the selected channel or content is distributed in the assembled PAT; and a receiving terminal for receiving information about the selected channel. Is PA
If it does not exist in the T, the NIT receiving step of receiving and assembling the NIT in order to recognize which TS the selected channel is distributed, and the receiving terminal uses the service list descriptor in the NIT to
In which TS the selected channel is distributed,
And a service type identification step of identifying a service type and a CAT existence determination step of performing reception processing and determining whether a CAT exists by performing a reception process when a storage type service is set by the service list descriptor. A data distribution method including a step in which a receiving terminal executes a pre-contract metadata receiving process when a TS packet for transmitting a CAT exists. 5. The method according to claim 4, wherein in the CAT presence determining step, if it is determined that the CAT does not exist, the receiving terminal receives the PAT in the TS. A data distribution method further comprising: assembling a PMT in which information of the specified channel is described; and receiving the terminal by performing a reception process by analyzing the assembled PMT. 6. The data distribution method according to claim 4, wherein the receiving terminal is stipulated by a standard if a service type other than the storage type service is specified by the service list descriptor. A data distribution method further comprising a step of performing an existing type reception process. 7. The data distribution method according to claim 1, wherein the pre-contract metadata receiving process executed when a CAT exists in the TS includes receiving a predetermined TS packet. Assembling the CAT, receiving the pre-contract metadata stream according to the conditional access system descriptor stored in the assembled CAT, and setting up the rights protection function (RMP) in the receiving terminal. A step of determining whether there is information addressed to the own terminal in the pre-contract metadata stream received by the stored terminal ID or personal ID, and that the pre-contract metadata for the terminal ID or personal ID held by the RMP is If it does not exist, the step of resuming the PAT reception. On the other hand, if the corresponding pre-contract metadata exists, the RMP Passing about meta data, PAT
A data distribution method including a step of restarting reception. 8. The data distribution method according to claim 7, wherein the storage process is performed when the storage enable / disable information of the content stored in the content usage information descriptor in the PMT describes that storage is possible. Temporarily storing storage / playback metadata in the corresponding content usage metadata specified by the content usage information descriptor in a storage medium, and storing the key distribution metadata in the content usage metadata in R
Handing over to the MP, decrypting the content with a common system key Ksy in all receiving terminals stored in the RMP if the broadcast is a non-limited broadcast such as a free broadcast, or RMP if the broadcast is a limited broadcast such as a pay broadcast Decrypting the content with a different operator key Kw for each operator stored in the pre-contract metadata and comparing the contract information in the pre-contract metadata with the target contract information stored in the key distribution meta data. Formally store the content temporarily stored in the storage medium and the storage / playback metadata if the access is permitted, and delete the information if the information is not permitted. . 9. The data distribution method according to claim 1, wherein the transmitting side distributes the metadata to the receiving side by extending the PSI information specified in the MPEG2 system, and the receiving side utilizes the metadata. A data distribution method for storing and receiving contents by using the method. 10. The data distribution method according to claim 9, wherein the information regarding whether or not the content can be stored is described in the PSI, so that the content is received and stored before the metadata is analyzed. 11. The data distribution method according to claim 9, wherein information relating to the distribution position of the metadata is described in the PSI, so that the metadata is received and stored before the metadata list is analyzed. Method.